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Title:
The Compact Central Object in the RX J0852.0-4622 Supernova Remnant
Authors:
Pavlov, George G.; Sanwal, Divas; Kızıltan, Bülent; Garmire, Gordon P.
Affiliation:
AA(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802; , ), AB(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802; , ), AC(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802; , ), AD(Department of Astronomy and Astrophysics, Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802; , )
Publication:
The Astrophysical Journal, Volume 559, Issue 2, pp. L131-L134. (ApJL Homepage)
Publication Date:
10/2001
Origin:
UCP
ApJ Keywords:
ISM: Individual: Alphanumeric: RX J0852.0-4622, Stars: Neutron, X-Rays: Individual: Alphanumeric: CXOU J085201.4-461753
DOI:
10.1086/323975
Bibliographic Code:
2001ApJ...559L.131P

Abstract

The central region of the recently discovered supernova remnant (SNR) RX J0852.0-4622 was observed with the Advanced CCD Imaging Spectrometer detector aboard the Chandra X-Ray Observatory. We found only one relatively bright source, about 4' north of the SNR center, with a flux of ~2×10-12 ergs s-1 cm-2 in the 0.5-10 keV band. The position of this pointlike source, CXOU J085201.4-461753, rules out its association with the two bright stars in the field, HD 76060 and Wray 16-30. Observations of the field with the Cerro Tololo Inter-American Observatory 0.9 m telescope show a star (R~17, B~19) at about 2.4" from the nominal X-ray position. We consider association of this star with the X-ray source unlikely and estimate a limiting magnitude of the optical counterpart as B>=22.5 and R>=21.0. Based on the X-ray-to-optical flux ratio, we argue that the X-ray source is likely the compact remnant of the supernova explosion that created the RX J0852.0-4622 SNR. The observed X-ray spectrum of the source is softer than spectra of magnetospheric radiation of rotation-powered pulsars, but it is harder than spectra of cooling neutron stars emitting thermal radiation from the entire surface, similar to the central compact source of the Cas A SNR. We suggest that CXOU J085201.4-461753 belongs to the growing family of radio-quiet compact central sources, presumably neutron stars, recently discovered in a number of SNRs.
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